<h1>app-component</h1>
<!-- <hello-world></hello-world> -->
<!-- <app-second></app-second>
<app-insert-data></app-insert-data>
<app-event-bind></app-event-bind> -->
<!-- <app-attr-bind></app-attr-bind> -->
<!-- <app-struct-derective></app-struct-derective> -->
<!-- <app-temp-var></app-temp-var> -->
<!-- <app-ng-model></app-ng-model> -->
<!-- <app-pipe-fun></app-pipe-fun> -->
<app-parent></app-parent>